大跨径三塔双主跨斜拉桥非线性风致静力失稳分析  

Nonlinear Wind-Induced Static Instability Analysis for Long-Span Cable-Stayed Bridges with Three Towers and Two Main Spans

作　　者：李渊[1,2] 杨詠昕[1,2] 郭增伟[1,2] 马婷婷[1,2] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2012年第1期87-93,共7页Structural Engineers

基　　金：国家自然科学基金资助项目(51078276);交通行业重点实验室自主课题(KLWRBMT-04);国家重点实验室自主课题(SLDRCE 10-B-05):联合资助

摘　　要：大跨径桥梁的风致静力失稳问题不容忽视。我国一座建成后将是世界上跨度最大的三塔双主跨斜拉桥的空气静力稳定性值得关注。依据大跨径桥梁非线性风致静力失稳分析理论,考虑荷载非线性与几何非线性,采用优化的增量与内外两重迭代相结合的方法对该桥的空气静力稳定性进行了分析。描述了该桥特殊的失稳形态,讨论了拉索、桥塔和辅助墩对其空气静力稳定性的影响及机理,并从风荷载与结构刚度的关系解释了该桥的风致静力失稳机理。Wind-induced static instability of long-span bridges cannot be ignored. The wind-induced static stability of a bridge under construction in China, which will be the longest cable-stayed bridge with three towers and two main spans in the world, deserves attention. On the basis of nonlinear wind-induced static instability theory of long-span bridges, and taking both load and geometric nonlinearity into consideration, its wind- induced static stability was analyzed by the improved incremental double iteration method . The special insta- bility configuration of the bridge was described, with the effect and mechanism of cables, towers and auxiliary piers on the wind-induced static stability discussed. The mechanism of wind-induced static instability was also analyzed from the perspective of relation between wind load and structural rigidity.

关 键 词：大跨径桥梁 三塔双主跨 风致静力失稳 非线性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]